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HIN202ACBN Datasheet | Intersil Corporation
Part No. : HIN202ACBN
Description : High Speed +5V Powered RS-232 Transmitters/Receivers
Download : HIN202ACBN Click to Download
Page Number : 17
Manufacturer : Intersil Corporation
File Size : 247 Kb

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ADO.NET provides a Connection to connect to the database, but also provides a Command object to query the database. Like the same Connection object, Command, there are two: OleDbCommand and SqlCommand. The difference between the same Connection object. To manipulate the database, you must first use the Connection to connect to the database, then create a Command to query. There are several ways to create, for example: SqlCommand cmd; string strCon = "server = localhost; database = Northwind; Trusted_Connection = Yes;"; string strqry = "select * from Categories"; SqlConnection con = new SqlConnection; con.Open; 1cmd = con.CreateCommand; / / use the Connection object is used here
DNS resolver is a DNS query to complete recursive server, which can be resolved to authorize the domain name. For example, in the internal network, you may have a DNS server to authorize the internal networks DNS server domain internalcorp.com. When the network clients use this DNS server to resolve techrepublic.com, this station to the other DNS server through the implementation of recursive queries to DNS servers to get the answer. DNS servers and DNS resolution is the difference between the DNS resolver is the Internet host name only for the resolution. DNS resolution can be unauthorized DNS caching only DNS server domain name. DNS resolver you can use only for internal users, you can make it only for external users, so you do not need to not control the external DNS servers set up, and to improve security. Of course, you can also make DNS resolution are simultaneously internal and external users.

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